AttributeError: 'gurobipy.Model' object has no attribute 'setObjectiveN'

[David Smith]

I'm running Gurobi 7.0.1 on Python and can't get multiobjective optimisation working. Has anyone else had the same problem and knows a way around it? Maybe there's an easy way of defining multiple objectives w/o using the `model.setObjectiveN()` function.

        import gurobipy as GRB

        model = GRB.Model("MultObj")

        set_params(model)

        x = model.addVars(x_dict.keys(),

                          lb=0.0, ub=1.0, vtype="C", name="x")

        y = model.addVars(y_dict.keys(),

                          vtype="B", name="y")

        z = model.addVars(z_dict.keys(),

                          vtype="B", name="z")

        obj1 = x.prod(x_dict) + y.prod(y_dict)

        model.setObjectiveN(obj1, 1, 2)

        model.setObjectiveN(z.sum(), 2, 2)

Where `set_params()` just sets some parameters for the optimisation (from tuning) and the `*_dicts` are just `{(index): obj_coeff}`.

The full error is regarding the `model.setObjectiveN()` function:

    File "model.pxi", line 281, in gurobipy.Model.__getattr__

    (../../src/python/gurobipy.c:49637)

    File "model.pxi", line 1418, in gurobipy.Model.getAttr 

    (../../src/python/gurobipy.c:62715)

    File "model.pxi", line 3724, in gurobipy.Model.__getattrinfo 

    (../../src/python/gurobipy.c:94154)

    AttributeError: 'gurobipy.Model' object has no 'setObjectiveN'

Cheers!

[Renan Garcia]

Please upgrade to the latest version of Gurobi, which is currently 7.5.2. The Model.setObjectiveN() was introduced in version 7.5.

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